Because these videos are directed to the audience of a channel with an already established following base

I think so too. I mean i do my best to actively follow the developments in Ukraine and even for me these sorts of channels are just too obsessive about every little minutiae of the battlefield. These videos really don't have much mass appeal beyond a very specific audience that is hyper-focused on following the most up to date updates of every FPV drone strike and every single building and tree line taken. To me this frankly isn't very interesting... i have a limited amount of free time and there are many other global events to keep up with, but i do think it's important that there are people who document everything and keep track of the maps so that the big picture analysts have solid data to draw from. Anyway, all that is to say that his audience probably understood the joke.